Method and apparatus for determining wheel alignment optical tar

Details Method and apparatus for determining wheel alignment optical tar Method and apparatus for determining wheel alignment optical tar

1998-11-19

2000-10-24

Fulton, Christopher W.

Geometrical instruments

Gauge

Wheel

33288, 356155, 35613909, G01B 11275

Patent

active

061347922

ABSTRACT:
An apparatus and method for determining the orientation parameters of a wheel-alignment optical target 10 affixed to a vehicle wheel 20 by a no-compensation wheel clamp 16. The wheel-alignment optical target includes a stub shaft 24 adapted for insertion within an axial bore 18 of the no-compensation wheel clamp after the wheel clamp is secured to the vehicle wheel. An optical imaging system observes the optical target and measures the orientation of the target face in a first position. The optical target is rotated partially about the longitudinal axis of the stub shaft, and the optical target is again observed and the orientation of the target face is again measured by the optical imaging system. By comparing the measured orientations of the optical target at the two rotational positions, a compensation vector Vc describing the alignment of the target face relative to the stub shaft is be determined and stored for subsequent uses of the optical target.

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